Measurement Tools

Push a parametric EQ filter to a device with DevicePEQ, measure the response before and after, and check the measured change against the textbook biquad — RMSE, correlation and effective Q — so a device's EQ can be trusted, or shown not to be.

Measure a headphone on a fixture at a centred seating and at forward, back, up and down offsets, and see how much of the response comes from where it sits rather than from the headphone. Compare against targets and preference bounds.

Reverse-engineer a Bluetooth headphone's built-in EQ: describe its sliders, capture each band at maximum and minimum, and fit the real filter behind every one, boost and cut separately. Export a profile others can use without a rig.

No rig needed. Load a shared profile of your headphone's EQ, pick a target curve, and get the slider values that bring it closest, bass and mids first with the treble as advisory. Copy them into the app or push them with DevicePEQ.

A quasi-anechoic speaker measurement in an ordinary room: gated sweeps with the speaker on a stool, an off-axis family from rotating it, near-field bass spliced in underneath, and an optional moving-microphone in-room pass for review graphs.

Measure your own head-related transfer functions with blocked-canal microphones, one fixed speaker and a rotating chair, gated to drop the room and referenced to the head-centre. Then compare a headphone at your ears against your own frontal response.